If forgiving depended on the culprit owning up, then the victim would always be at the mercy of the perpetrator. The victim would be bound in the shackles of victimhood.
As the victim, you offer the gift of your forgiving to the perpetrator who may or may not appropriate the gift but it has been offered and thereby it liberates the victim.
Forgiving is a gift to the forgiver as well as to the perpetrator.
To forgive is to abandon your right to pay back the predator in his own coin, but it is the loss that Liberates.
To forgive is not just to be altruistic.
True reconciliation is never cheap, for it is based on forgiveness which is costly. Forgiveness in turn depends on repentance, which has to be based on an acknowledgment of what was done wrong, and therefore on disclosure of the truth. You cannot forgive what you do not know.
To forgive is indeed the best form of self-interest since anger, resentment, and revenge are corrosive of that summum bonum, the greatest good.
Forgiveness does not mean condoning what has been done. Forgiving means abandoning your right to pay back the perpetrator in his own coin.
Forgiveness is something that we are often asked to grant and very few of us ever have the roadmap of how to get from the pain that we have experienced to being able to forgive someone.